Spontaneous solution-sol-gel process for preparing tin oxide monolith
| Autor: | Lih-Fu Wu, Nae-Lih Wu, Shu-Jiuan Huang, Ya-Chin Yang |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
geography
geography.geographical_feature_category Materials science Mechanical Engineering Condensation Condensed Matter Physics Tin oxide Chloride Catalytic oxidation Chemical engineering Mechanics of Materials Reagent Specific surface area medicine General Materials Science Monolith Hydrate medicine.drug |
| Zdroj: | Journal of Materials Research. 11:813-820 |
| ISSN: | 2044-5326 0884-2914 |
| DOI: | 10.1557/jmr.1996.0098 |
| Popis: | A sol-gel process for preparing SnO2 monolith of high specific surface area and transparency from chloride solution is described. Without introducing any alkaline precipitating reagent to induce condensation, this new process employs tin chloride (or its hydrate), water, and, optionally, alcohols as the only process reagents. Spontaneous solution-to-sol and sol-to-gel transitions take place upon mixing these reagents under appropriate conditions, and the entire transition processes are carried out under acidic conditions (typically pH ≤ 4.0). The rate of condensation has been found to increase with decreasing SnCl4 concentration, which corresponds to decreasing solution acidity, and with increasing temperature. For fixed starting salt concentration and temperature, there exists an optimum amount of ethanol addition for the fastest condensation. Good performance of thus derived SnO2 monolith has been demonstrated in two applications, including catalytic oxidation and solid-state gas-sensing for carbon monoxide. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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